Regarding Urban Organics, they are no longer using T5s. They are now using Inda-Gro Induction lights. Not sure if they have replaced all of the lights but are in the process. The thing that struck me about their operation when I was first introduced to it by the folks at Inda-Gro, was that it was clear to me from my own T5 experience that they didn't have enough light. This can be seen from their Facebook pictures showing a crowning of their growth near the center directly under the lights.

T5s have to be right on top of the plant canopy and cover all of the plants for optimum growing. The bulb spacing of a T5 fixture is set to deliver the right amount of light to the plants only if it is almost touching them. If you raise the light up and try to stretch out the light to cover a larger area, like Urban Organics tried, then you will get the same results they experienced. The tube spacing on the T5s we were using before changing them out for Induction lights was 3 inches between tubes. This should start at the edge of your growing area and extend to the opposite edge with as many T5 tubes as it takes. Going beyond the growing area is advisable in order to cover the outside plants with light coming from both sides. The down side of extending the light beyond the growing area is the added light cost and the energy required.

Oliver